It’s a redox reaction since k has been oxidised and h has been reduced. i doubt it’s a combustion rxn since the end products should be C0₂ and H₂0
The gradient of a stream ( or commonly knwon as path of the stream) depend on its :
- Slope of the land,
- Geologic Structures , as in its fractures and faults
- rock hardess
- And its water retention
Beacause they all belong to a partcular kingdom which operates protons
